George e



duurt States @atc-nt dtiitrr.

Letters Patent No. 95,365, dated Septmnbcfr 28,1869.

IMPROVEMENT IN BLEACHING-PAPER-STOCK.

The Schedule areferred to in these Letters Patent and makingpart of thellame.

To all whom 'it may concern:

Be it known that I, GEORGE E MARSHALL, of Laurel, in the county ofFranklin, andStat'e of Indana, have invented certain new and usefulImprovements in the Manufacture of Paper-Stock; andl I do hereby declarethat the following is a full, clear, and exact description lthereof,reference being hadt-o the .accompanying drawings, making part of thisspecification, and to the letters of reference marked thereon, likeletters indicating like parts wherever they occur.

To enable others skilled in the art to construct and use my invention, Iwill proceed to describeit.

My invention relates t0 the manufacture of paperstock; and v Theinvention consists in so arranging a cover and fan as to create acurrent that shall gather the chlorine-gas that is evolved in thebleaching-process, and return it t0 st0ck,las hereinafter explained.

Figure 1v is an end elevation of an apparatus adapted for carrying outmy invention.

Figure 2 is a vertical section of the same, on the line :thx of lg. l.Aiggure 3, a horizontal section, on the line fyy of gv It is well knownthat in bleaching paper-stock in the ordinary rag-engine, in order toproduce a quick action of the chlorine, it is necessary. or usual to addto the chlorine-solution -either an acid, or toA apply heat, and that alarge portion V0f the .chlorine-gas escapes, and passes off into theatmosphere, and that thus a loss'is effected, besides rendering it veryunpleasant, and at times impossible for the workmen to remain in theroom, the inhalation of the `chlorine-gas being very injuriiou's.

l Efforts have been made to retain thisgasin the ragengine by aclose-fitting cover; but this is objectionable for several reasons, moreespecially because, it prevents the operator from having access to thematerial;

which is necessary, in order to stir it, and prevent p0rtions fromaccumulating in the corners, and thus fail- This cover should extend outbeyond the tub A,v

more or less all around, and it has located at its apex er topa fan, C,so arranged as to suck a strong cul'- rent from the outside inward,under the cover, into its case., and expel it thence through a tube, I),which extends from the fan-case, down into the tub or engine A, asrepresented in the drawings.

Any of the usual styles of tan or blower maybe A used, it, of. course,being arranged to draw the air in under the cover B, and expel it thencethrough the tube D. i

With an apparatus thus arranged, it will be obvious that thechloline-gas, as it rises from the engine, instead of passing olf intothe surrounding atmosphere oi the room, will be drawn inward by theincoming current of air, and will be drawn with it into the fan, andfrom thence, be driven back into the solution y again, thusaccomplishing the twofold'purpose of preventing its waste, and, at thesame time, enablingthe operatives to stand near the 'engine ortubwithout in. haling the gas.

In order to have more perfect'control of the returning gas, I connect tothe end of tube D, where it en-` ters the tub A, a section of tube I,that is movable,` heingjournalled at its ends, so as to be turned like ashaft.

From the side of this tube I there projects laterally a series of smallpipesI or nozzles, a, as shown in gs. 2 and 3, and there is a lever, l,attached to the tube I,

so that the pipes a, may have their points` lowered to deliver theinlowing current, of gas into or under the fluid and stock, or raised,as 'shown in dotted lines in g. 2, to deliver the gas upon the stockabove the surface of the solution, asit is being operated upon by thecylinder-ofthe engine.

It is obvious that the cover B may be mounted on stationary supports, asrepresented in. the drawings, or it may be arranged so as to be raisedor lowered, as occasion may require, in which case the tube `I) would bemade with a sliding joint, or of exible material.

In any event, the sides of `the cover-B shoulder;- tend down far enoughto be sure that the inflowing current `of air shall take up, and carryin all or nearly all the gas as it .rises from the engine -or tub, and,if necessary, there may be curtains or movable sides arranged to extenddown as far as required, so

that they can be adjusted or removed. at pleasure.

The tube D, instead of entering at the ridge, may be arranged to'enterthrough the bottom, or it may extend all around, 0r be coiled over thebottom', and provided With a series of minute openings to discharge thegas and air intofall parts of the solution, and thus cause it toimpregnate the mass' thoroughly,- the es-x caping gas lalso serving tostir up .and thoroughly mix the mass, and thereby insure an evenbleaching of the stock.

In 4this way the necessity of hand-stirring may be avoided.

The application of my invention may be varied greatly, without departingfrom its principle or mode of action, the accompanyingdrawingillustrating but one of many forms of apparatus for applying it.'

It is also obvious that my invention is applicable to the bleaching ofother materials as Well as pape-stock,

such as cloths, and all similar articles.

Having thus described my invention, What I claim, is

1. Gathering the 4escaping gases evolved frornthe bleachingsolution, andconveying Ithem awa.y by an inowing current of air, produced by a fan orequiyaf lent means, substantially as described.

2. The utilization'of said gases, by returning them to the tub orreservoir, substantially as described.

3. The combination of a bleaching-tub or reservoir, a receiver or cover,and a fau or its equivalent, substantially as and for, the purposesetforth.v

4. The adjustable deliverypipes a, arranged to receive and deliver thegas, either within or above the 4vHuid orsolvution, as set forth.

GEO. E. MARSHALL. Witnesses= Y* i PETER O. AKERS, T. G. Pxxn.

